Loss of the Reception of the FIDS Bus by the CFDIU

TASK 31-32-00-810-899-A
Loss of the Reception of the FIDS Bus by the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-66-34-000-002	Removal of the FAC
AMM 22-66-34-400-002	Installation of the FAC
ASM 226901
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU

3. Fault Confirmation
Subtask 31-32-00-865-146-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04

Subtask 31-32-00-740-244-A

B. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 31-32-00-810-149-A

A. If the test gives the maintenance message NO FAC1 DATA:

(1) If the fault continues:

(a) If the fault continues:

do a check and repair the wiring of the FIDS bus from the FAC 1 (1CC1) to the CFDIU (1TW) ASM 226901.

Subtask 31-32-00-740-245-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:29:56 UTC